norman/friendly_id — pull request #307 by aduffeck (2012-07-03 12:13:16+00:00)
Title: make :scoped and :history modules compatible with each other

Up to now it wasn't possible to use the :scoped and :history modules together. This is fixed by adding a ```serialized_scope``` method wich is stored in the slugs table and used for detecting conflicts.

fixes #215